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State-of-charge Estimation of Lithium-ion Battery Based on Modified Ampere-hour Integral Method
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Ye LIANG  Student Member, CPSS1, Mengye CAI1, Yanfeng JIANG1, Huigang WANG2
Journal of Power Supply | 2026, 24(8) : 131 - 139
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Journal of Power Supply | 2026, 24(8): 131-139
• Renewable Energy Generation and Energy Storage •
State-of-charge Estimation of Lithium-ion Battery Based on Modified Ampere-hour Integral Method
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Ye LIANG  Student Member, CPSS1, Mengye CAI1, Yanfeng JIANG1, Huigang WANG2
Affiliations
  • 1.School of Integrated Circuits, Jiangnan University, Jiangyin 214442, China
  • 2.Advanced Technology Research Institute, Wuxi China Resources Microelectronics Co., Ltd., Wuxi 214061, China
Published: 2026-08-30 doi: 10.13234/j.issn.2095-2805.2026.8.131
Outline
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The state-of-charge (SOC) of a lithium-ion battery is an important parameter that reflects the state of its remaining energy. To address the issues of the initial SOC being indeterminate and the cumulative error increasing over time in the ampere-hour integral method, an algorithm is proposed to correct the error in the ampere-hour integral method. Through the study of the charge and discharge characteristics of a lithium-ion iron phosphate battery, the open circuit voltage-SOC (OCV-SOC) curve and the DC internal resistance-terminal voltage curve are obtained. The proposed algorithm calibrates the SOC when the battery reaches the full charge condition during charging, and it performs online error calibration based on the battery’s characteristic curves when the values of capacity are 7% in the discharge state respectively. The experimental results show that it can effectively reduce the error in the SOC estimation process and control it within 2.00%, indicating a high estimation accuracy.

Lithium-ion battery  /  state-of-charge (SOC)  /  ampere-hour integral method  /  battery management system (BMS)  /  error correction
梁叶中国电源学会学生会员, 蔡孟冶, 姜岩峰, 王会刚. 基于修正安时积分法的锂离子电池荷电状态估算. 电源学报, 2026 , 24 (8) : 131 -139 . DOI: 10.13234/j.issn.2095-2805.2026.8.131
Ye LIANG, Mengye CAI, Yanfeng JIANG, Huigang WANG. State-of-charge Estimation of Lithium-ion Battery Based on Modified Ampere-hour Integral Method[J]. Journal of Power Supply, 2026 , 24 (8) : 131 -139 . DOI: 10.13234/j.issn.2095-2805.2026.8.131
Funding
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  • National Key Research and Development Program of China(2024YFB4505400)
Appendix
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Year 2026 volume 24 Issue 8
26
2
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Article Info
doi: 10.13234/j.issn.2095-2805.2026.8.131
  • Receive Date：2024-11-15
  • Online Date：2026-10-29
  • Published：2026-08-30
Article Data
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History
  • Received：2024-11-15
  • Revised：2024-12-30
  • Accepted：2025-01-21
Funding
National Key Research and Development Program of China(2024YFB4505400)
Affiliations
    1.School of Integrated Circuits, Jiangnan University, Jiangyin 214442, China
    2.Advanced Technology Research Institute, Wuxi China Resources Microelectronics Co., Ltd., Wuxi 214061, China
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红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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